In the past I have had to explain to people that because you are filling in a seperate (non-customisable) form to mark an oppertunity as won then there is no way to tell what is happening to the opp as it is saved.

However while searching for something else I came across this article that details a very neat work around and one that I will be using in the future.

MS CRM Blogs of Note

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The content of this blog is my own work and do not represent the views of my employer, feel free to copy any code or ideas but please be aware that I provide no warranty, little support and accept no responsibility for anything bad that happens to you or your machines. NEVER apply anything you find on the Internet directly to a production machine because if you do you deserve everything you get ;)